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Impact evaluation of agrotechnologies in watersheds

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Abstract

The special project RAISA (Advanced Researches for Innovation in Agricultural Systems) of the National Research Council of Italy concerns the development of new methodologies for the study and evaluation of the impact of agrotechnologies on the environment. In the project, several trans-disciplinary Units have worked together since 1990. The aim of the project is to define systems, using tools such as remote sensing and Geographical Information Systems, for decision making support in land planning and land use management, with particular attention to groudwater table pollution. The fundamental steps for evaluation of the impact of agrotechnologies on the Po river watershed, 75,000 km2 in northern Italy, and Tevere (Tiber) river watershed, 17.169 km2 in Central Italy are described here. The study concerns particular areas located in the western part of the Po River plain, where flooded rice is the main crop, and in the central plain of the Tevere basin where the risk of water pollution is considerable, due to small and medium sized swine breeding farms. The aspects considered were water pollution due to mineral nitrogen used to fertilize the rice crop and the nitrogen contained in the waste water from pig farms. For the Po river basin the methodology developed was based on the integration of satellite remote sensing images, and the available cartography, such as topographic and thematic maps, together with the hydrological and the toxicological data of the chemical fertilizers employed, summarized in maps of the groundwater table pollution hazard. A simpler evaluation was obtained in the Tevere river basin: the thematic layers were crossed in bi-directional matrices and the result merged with the map of the territorial distributionof the swine. In both cases the selected information was integrated and processed in Integrated sub-basin scale. The GISs led to the development of a user-friendly system for formalizing our knowledge of the degree of pollution hazard in simple and readable maps.

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Authors and Affiliations

  1. IRRS Telerilevamento, National Research Counsil of Italy, Via Ampère 56, 20131, Milano, Italy

    M. A. Gomarasca

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  1. M. A. Gomarasca
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Research supported by National Research Council of Italy, Special Project RAISA, sub-project N. 1 Paper N.

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Gomarasca, M.A. Impact evaluation of agrotechnologies in watersheds. Environ Monit Assess 41, 159–170 (1996). https://doi.org/10.1007/BF00394341

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